package main.Q2601_2700;

public class Q2681_2690 {
    public static void main(String[] args) {
        System.out.println("Question2681：");
        System.out.println("Question2682：");
        System.out.println("Question2683：相邻值的按位异或");
        System.out.println("Question2684：");
        System.out.println("Question2685：");
        System.out.println("Question2686：");
        System.out.println("Question2687：");
        System.out.println("Question2688：");
        System.out.println("Question2689：");
        System.out.println("Question2690：");
    }
}

class Question2683 {
    public boolean doesValidArrayExist(int[] derived) {
        int xor = 0;
        for (int num : derived) {
            xor ^= num;
        }
        return xor == 0;
    }
}